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US President Donald Trump has opened his most consequential trip of the year in Japan as world leaders gathered for the G20 summit Osaka on Friday.

The US president has marked the days leading up to the event by levelling criticism at some of the countries whose heads of state he is due to meet.

Over the next three days he intends to hold nine bilateral meetings on the sidelines of the conference, eight of which are likely to prove difficult. The exception is his meeting with Brazilian President Jair Bolsonaro, which should not present any problems.

The list of Mr Trump's grievances with allies and enemies is long, with many of them aired publicly on Twitter.

Japan: Prime Minister Shinzo Abe...

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